SUBSTANCE: transformer part of a unit is made with a primary winding connected to a three-phase circuit, and with a secondary z-phase bar winding, arranged in z slots of a transformer magnetic conductor closed at one side with an end ring. The drive part of the unit comprises an induction motor with a short-circuited rotor and stator with a bar winding, electrically connected with the secondary winding of the transformer, and at the other side closed with the end ring. The bars of the secondary winding of the transformer are connected with Z bars-feedthrough plates arranged in a tight partition. Each bar-feedthrough plate at the other side is electrically connected with n bars of the stator winding via intermediate electric wire arched segments adjoining the stator (where n=1, 2, … - multiple number between the bars of the stator winding and the secondary winding of the transformer).
EFFECT: expanded area of application and increased energy characteristics and reliability of a drive-transformer unit.
The invention relates to the field of special electrical machines, namely, to design asynchronous electric sealed engines used in industrial plants to operate in a chemically aggressive, radiation and explosive gaseous and liquid environments, at high pressures and temperatures.
Known for asynchronous motors for devices operating in an airtight objects or aggressive media, with the stator being located beyond the object (environment)in which the rotor is spinning, and separated from the rotor sealed partition-screen [1, p.26, Fig.5]. Motor , contains installed in the housing, the stator and the rotor located in the cavities separated by a sealed partition. Sealed wall-the screen is made in the form of a continuous, thin-walled cylindrical sleeve located between the stator and the rotor.
The drawbacks of such motors are low power characteristics due to the increased thickness of the liner gap between the stator and the rotor. In addition, some of the energy of the electromagnetic field is not transmitted to the rotor, and is allocated in the form of heat from eddy currents induced in the screen while crossing his main magnetic flux. Other disadvantages are complex systems unloading of thin-walled sleeve from axial-radial the effort in sealed object and difficulty of heat dissipation from the rotor, located in a sealed cavity and covered the main source of heat.
Also known asynchronous motors for devices operating in an airtight objects or aggressive environments . The electric motor for sealed objects described in  and adopted as a prototype, is, as said in the description, motor-transformer unit including motor and transformer device. The unit contains a motor with a stator and a rotor located inside the sealed object, separated from the transformer wall and transformer-voltage Converter and the number of phases with a rotating magnetic field, performed with the primary winding connected to a three-phase network and the secondary z-phase core winding, located in z the slots of the magnetic core of the transformer, closed with one hand short ring, and on the other, connected with Z terminals of the stator winding.
A disadvantage of this device is a significant departure and the amount of copper windshields parts of the primary distributed winding of the transformer with a large number of grooves per pole and phase (more than two). This accordingly leads to an increase in the length of the connecting rods between the secondary winding of the transformer and the stator winding of motor cha the tee Assembly, thus, reducing its energy performance. In addition, when a large number of connecting rods, is complicated by their tight installation in the partition and reduces the reliability of the unit.
The task of the invention is to expand the scope and improve energy performance and reliability of the motor-transformer unit.
The problem is solved due to the fact that motor-transformer unit includes a motor and a transformer device. Transformer Assembly part made with the primary winding connected to a three-phase network and the secondary z-phase core winding, located in z the slots of the magnetic core of the transformer, closed with one hand short ring.
The motor part of the unit contains asynchronous motor with squirrel-cage rotor and a stator with a core winding is electrically connected with the second core winding of the transformer, and on the other side of the closed short ring.
In contrast to the known technical solutions of the motor is located inside the sealed object, separated from the transformer by a partition, and the terminals of the transformer are connected with Z terminals-inputs located in the partition, each with Ergen-hermetical input from the other side electrically connected to the n terminals of the stator winding through an intermediate electrically conductive arcuate segments, adjacent to the stator (where n=1, 2, ... times the number between the terminals of the stator winding and the secondary winding of the transformer). The electrical connection of each terminal of the secondary winding of the transformer with n terminals of the stator winding is made in the motor part of the unit.
The performance of motor-transformer unit in accordance with the above basic characteristics expands the possible applications, but also improves energy performance and reliability by reducing the length of the connecting rods between the secondary winding of the transformer and the stator winding motor of the unit, thereby improving its energy performance. In addition, with a smaller n times the number of connecting rods, simplified their tight installation in the partition and increases reliability of the Assembly.
Signs relating to the performance of the magnetic circuit of the transformer is cylindrical, and the stator and rotor of the motor - drive, develop common signs and are therefore private.
The invention is illustrated by drawings. 1 shows a longitudinal section of a motor-transformer unit. Figure 2 - cross section a-a motor with a stator disk. Figure 3 is a detailed circular cross-section B-B along the axes of the rod-inputs. Figure 4 - scan active p the surfaces of the transformer and the stator side rods (figure 4, a); the distribution of the magnetomotive forces (MMF) by the average diameter of the transformer and the motor from the currents in the core windings of the transformer (figure 4, b) and stator (figure 4, C), respectively.
Motor-transformer unit contains a transformer device 1 and the motor control device 2. The transformer 1 is made with the primary distributed winding 3 connected to three-phase AC power and a secondary z-phase core coil 4 located at z grooves 5 of the magnetic circuit 6 of the transformer 1, the Terminals 4 of the secondary winding of the transformer 1 are closed with one hand short ring 7. Induction motor 2 is made with squirrel-cage rotor 8 and the stator 9 with the core winding 10, which is located in the slots of the core 11. The rods 10 of the stator winding 9 on the one hand electrically connected through terminals-inputs 12 from the secondary core winding 4 of the transformer 1, and on the other hand short-circuited ring 13. The motor 2 that is located inside the sealed object, separated from the transformer 1 by a partition 14. Each of the Z rods-inputs 12, located in the partition 14, is electrically connected to the n terminals 10 of the stator winding 9 through an intermediate electrically conductive arcuate segments 16 (where n=1, 2, ... times the number between the terminals of the stator winding and arinami secondary winding of the transformer). The electrical connection of each terminal of the secondary winding of the transformer 4 with n terminals 10 of the stator winding through the arcuate segments 16 in the motor part of the unit. The partition wall 14 may be part of a flange of the body of the motor, hermetically closing the hatch in the hull sealed object (not shown), or may be a part of the body sealed object.
Motor-transformer unit (DTA) works as follows.
When connecting the primary three-phase distributed winding 3 of the transformer 1 with p pairs of poles of the three-phase network with a frequency of f arise flowing currents, which create a rotating magnetic field with a frequency of rotation n1=60f/p. This field, crossing the rods 4 secondary Z-phase winding of the transformer (Z is the number of cores) induce in them an electromotive force (EMF). In the Z-phase core winding 4 of the transformer 1 is electrically connected through terminals-inputs 12 and arcuate segments 16 nZ-phase core winding 10 of the stator 9 currents, creating a stepped curve magnetomotive force (MMF) FT(see figure 4, b). The first harmonic of the MDS rotates with the same frequency as the rotating magnetic field of the transformer. Z-phase currents of the secondary core winding 4 of the transformer 1 with arcuate segments 16 are separated at the input of the sty what Neveu winding 10 of the stator 9 to nZ-phase currents (n=1, 2, ...), keeping the same number of poles 2p. nZ-phase currents flowing through the terminals 10, forms a stepped curve magnetomotive force (MMF) FS(see figure 4,) and creates in the working gap between the stator 9 and a squirrel-cage rotor (KS-rotor 8 rotating magnetic field with the same number of poles 2p and with the same frequency of rotation n1that field of the transformer 1. This field passing through the rotor 8, suggests in his squirrel-cage winding EMF that causes the flow in this winding currents and creates electromagnetic torque, which drives the rotor in rotation, just like a standard asynchronous motor with short-circuit the rotor.
The above design is essentially the aggregate of the two electrical machines (a type of machine-transformer units, considered in ), electrically connected core windings 4 and 10 sealed and separated by a partition 14. One electric machine (on the left side of the baffle 14) is a step-down transformer 1 with a rotating magnetic field and the Converter of the number of phases of the m1=3 for three-phase distributed winding stator 3, connected to a three-phase network, the number of phases m2=Z for the secondary main winding 4 of the transformer. The secondary winding of the transformer forms a Z-phase radial star electrically closed ring 7. W heaven electric machine (on the right side of the baffle 14) is an asynchronous motor with a conventional squirrel-cage rotor 8 and the stator 9 with nZ-phase core excitation winding, electrically closed ring 9 and is connected to the secondary winding of the transformer 4 through the electric terminals-inputs 12 and arcuate segments 16.
Motor part DTA made with low-voltage core stator winding 9 without insulation coating rods 10 (similar to a squirrel-cage winding of the rotor of a conventional induction motor). This gives you the opportunity to upgrade to one of the fill factor of the slots provodnikovym material and to minimize the length of the frontal parts of the windings, thereby to increase energy performance in the motor part of the unit. Phase voltage supplied to the core winding 10 of the stator does not exceed 2-3 volts. This design of the engine allows it to be used in explosive or flammable environments and at high ambient temperatures (up to 500-600°) and strong radiation radiation (for example, the drive mechanisms in the area of nuclear reactor power plants).
In this design DTA solved the problem of improving the harmonic content of MDS nZ-pivotal phase winding of the stator (see Fig 4) compared with MDS secondary Z-phase core transformer winding (Fig 4, b) reduced n times the number of sealed bushings 12 in the motor part of the DTA.
In this case, the primary winding of transformer frequent the DTA can be used with a minimum number of slots per pole and phase q=1. This simplifies the laying of the coils and reduces the length of the flight and the intensity windshields parts of the primary winding of the transformer that provides minimum weight and dimensions of the unit.
Disk execution of the stator and rotor of the motor part of the DTA provides a small axial length is often a necessary requirement for engines sealed objects, working in extreme environmental conditions, and also provides structural plasticity at the junction of the working bodies of the drive.
Sources of information
1. Wisniewski N.E., Guchanov N.P., Kovalev I.S. Machines and apparatus with sealed drive. Leningrad: Mashinostroenie, 1977.
2. Fence I.G., Vildanov CA and other Motor for sealed objects. RF patent №2173926. Publ. 20.09.2001. Bull. No. 26.
3. Sveceny D.V., Fence I.G. Machine-transformer Assembly // Electrical engineering. 1998. No. 9. P.1-8.
1. Motor-transformer unit including motor and transformer device containing a transformer made with the primary winding connected to a three-phase network, and the secondary z-phase core winding, located in z the slots of the magnetic core of the transformer, closed with one hand short ring, and asynchronous motor with squirrel-cage rotor and a stator with sterzhneva the winding, electrically connected with the second core winding of the transformer, and on the other hand short ring, characterized in that the electric motor is located inside the sealed object, separated from the transformer by a partition, and the terminals of the secondary winding of the transformer is connected with Z terminals-inputs located in the partition, each rod-hermetical input from the other side electrically connected to the n terminals of the stator winding through an intermediate electrically conductive arcuate segments adjacent to the stator (where n=1, 2,... times the number between the terminals of the stator winding and the secondary winding of the transformer), while the electrical connection of each terminal of the secondary transformer with n terminals of the stator winding is made in the motor part of the unit.
2. The Assembly according to claim 1, characterized in that the magnetic core of the transformer is made cylindrical, and the stator and the rotor disc.
SUBSTANCE: invention relates to design of electric machines, in particular, a three-phase asynchronous hydrogenerator with a rotor and a stator, and also with a winding comprising multiple winding rods (17, 18) stretching in axial direction, lying above each other in appropriate slots of the yoke winding, besides, winding rods (17, 18) protrude from the winding slots at the ends of the machine and in the front part (13 a, b) of the winding according to the specified circuit are multiply pairwise electrically connected to each other, besides, the upper rod (18) of the winding of the first winding slot and accordingly the second rod (17) of the second winding slot is therefore bent to each other, so that their ends (21, 22) in axial direction cross above each other, and the connection (16) of the winding rods (17, 18) of the electrically connected pair of winding rods is carried out with the help of a solid connection element (27). At the same time, according to this invention, the ends of electrically connected to each other winding rods (17, 18) the windings are made as straight tabs (21, 22) of rectangular section, and the connection element is made as a round eyelet (27) aligned in the radial direction, having two radially crossing above each other support surfaces (28, 29) for arrangement of on the tabs (21, 22) of the winding rods (17, 18) connected with each other.
EFFECT: provision of higher mechanical stability of a structure and simultaneously simpler assembly, minimisation of transition resistances, with preservation of a front part of a winding shortened in axial direction.
13 cl, 4 dwg
SUBSTANCE: rotor, in particular, of a turbogenerator comprises a winding made of coils (1) from current-conducting strands with turns covering a pole and laid into slots (2), at the same time, according to the invention, each coil (1) has concentric arrangement of turns placed in one layer in all slots (2), related to the pole division of the rotor. This invention is especially relevant for synchronous nonsalient-pole electric machines with air cooling.
EFFECT: higher capacity of a synchronous nonsalient-pole electric machine without variation of its rotor dimensions.
2 cl, 3 dwg
SUBSTANCE: odd coils (1) and even coils (2) of a winding are arranged on cogs without crowns (3) of a stator with a back (4). Due to arrangement of even coils with external surfaces on an active length in the form of planes parallel to axes of their cogs, and odd coils - with external surfaces on an active length in the form of planes parallel to axes of the adjacent cogs, the electric machine stator winding is produced, making it possible to fully use a cog-to-cog space of the stator and to reduce capacity of losses in the stator winding at the same MMF, preserving at the same time the possibility of separate winding of coils and their subsequent installation on cogs, which increases manufacturability of stator winding manufacturing and increases repairability.
EFFECT: increased area of coils cross section and reduced capacity of losses in them with preservation of MMF, higher manufacturability of a stator winding.
SUBSTANCE: electromechanical converter comprises at least one stator-rotor pair, where a stator comprises cores from material with high magnetic permeability, with their ends attached to a support stator ring and aligned in parallel to the main magnetic flow, and between which there are conductors of a multiphase winding, a rotor is made in the form of two coaxially arranged outer and inner inducers - magnetic conductors from material with high magnetic permeability in the form of hollow cylinders fixed as capable of rotation relative to the stator, bearing poles arranged along circumferences with alternating polarity, inverted to the stator via working gaps and covering it, at the same time polarity of poles arranged on the inner and outer inducers opposite to each other is arranged as matching, and number p of pole pairs and number Z of stator cores are related by certain ratios for a double-phase winding (m = 2) and for a triple-phase winding (m = 3).
EFFECT: expanded field of application of an electromechanical converter, simplification of its design with simultaneous increase in accuracy of stator winding phase switching moments, lower requirement to sensitivity of used sensors of rotor angular position and their stability, provision of more accurate moments of phases switching and simplified control operations in production and diagnostics of the converter.
10 cl, 2 dwg
SUBSTANCE: bar wave winding of stator of asynchronous motor is single-layer, and winding bars are solid; at that, height of bar hb, which is determined using the equations for damping factor kd and relative current displacement factor ξ, which are calculated at maximum frequency value f of supply voltage on condition that damping factor kd is at least by two times more than the value of the required control range of rotation frequency of asynchronous motor.
EFFECT: enlarging the control range of rotation frequency of asynchronous motor owing to increasing its maximum moment at increase of supply voltage frequency, as well as simplifying the design of bar wave winding owing to its single-layer design at one bar in each slot, which allows considerably reducing labour intensity for manufacture of asynchronous motor and reducing the sizes of front parts of winding.
2 cl, 3 dwg
SUBSTANCE: in AC electric machine, comprising rotor and stator with winding arranged in it and made of K coils, it is suggested to install coils in stator winding so that central angle α1 between axes of cross sections of sides of each coil, determining width of coil, equals α1=(360°+60°·m)/2K; number of coils K is determined by ratio K=(1+m/6)·p, where m - number of phases, p - number of pole pairs of magnetic field, at the same time p is multiple of three for m = 2 and is multiple of two for m = 3.
EFFECT: increased torque and reduction of its pulsations, reduced losses of power in electric machine by development of magnetic flow by stator, acting at all poles of rotor with forces of one direction and having one fixed number of poles, equal to number of rotor poles.
3 cl, 4 dwg
SUBSTANCE: proposed drive is arranged with stator (1) from several segments when looked at in direction of perimeter (3, 4, 5, 6), which accordingly have closed circuit of winding connection, and rotor made of segments, which are on jointly rotating facilities and there electromagnetically interact with system of stator winding (1).
EFFECT: simplified assembly of direct drive for powerful drives on driving plant, when there is no necessity to provide insulations on winding of this drive stator.
5 cl, 3 dwg
FIELD: electrical engineering.
SUBSTANCE: according to suggested method of wave windings installation every section (70) of phase winding is formed as sequence of teeth (71) with two side branches (711) for installation into setting position in the groove, sections of winding (70) are placed onto mounting tool (80), turns (73) are laid into stator grooves in the order that is reverse to order of winding, at that sections (70) of winding are simultaneously laid around mounting tool (80), at that turns (73) that follow one another in preset order of winding are related alternately to different sections (70) of winding, which may be arranged as simple wave or distributed wave. Also stator of multi-phase rotating machine is suggested, which contains laminated packet (10) with central opening and axial slots (30), which are provided on the internal side on radial surface of laminated packet (10), in which wave winding is installed, which is laid into stator slots according to suggested method.
EFFECT: increase of power.
18 cl, 16 dwg
SUBSTANCE: invention is attributed to the field of electric engineering and concerns execution particularities of coil windings for stators or rotors of electric machines with inside-open slots. Substance of invention consists in manufacturing of coil winding for stators or rotors where each coil turn with corresponding jumper wire (14) lays in two stator or rotor slots respectively and both jumper wires (14) are connected by frontal part (16) of winding protruding out of stator or rotor butt-end surface. At that simultaneously several coils are made by means of n parallel wires (10) winding on rotating pattern. To obtain smaller frontal winding parts, the jumper (14) and the frontal part (16) is alternatively created of each of parallel wires (10) on pattern (20) in the first working stage A. After that in working stage B, created jumpers (14) and wire guide are shifted together with one of the ends of these frontal parts (16) by means of axial moving of pattern (20). After multiple repetitions of working stages A and B, jumpers (14) are created for the last n stator slots. After that winding is removed from the pattern, flat-squeesed, put into coil receiver in the form of strip plate, then shift to open in radial direction slots of transfer tool and squeese out of them in radial direction outside into stator or rotor slots. Also device is suggested for manufacturing of stator or rotor with these windings.
EFFECT: providing of narrow in radial direction structure of winding frontal parts for certain cross-sections of wire in stator or rotor slot cross-section irrespective to winding insertion into rotor or stator method.
21 cl, 19 dwg
FIELD: electric engineering and electro-mechanical industry, namely, windings of electric machines.
SUBSTANCE: winding of electric machine, consisting of rigid coils, is made of rectangular cross-section wire and has groove and frontal parts. In accordance to the invention, each rod of winding during transition from groove part to frontal part and backwards is twice bent along the line passing at an angle of 45 degrees to longitudinal axis of wide side of rod, and frontal parts of coils of different phases of winding are positioned one after the other along the rotation axis of machine and bent along a circle.
EFFECT: ensured minimal possible overhang of frontal parts of winding coils due to their radial positioning, and also due to simplified manufacturing technology of coil and reduced fault probability of winding isolation due to the fact that rods are bent along their wide side.
SUBSTANCE: in electrical machine the second armature winding is made combined and located in stator slots of the main magnet core; it is equipped with capacitor bank. Second inductor winding is also combines, multi-phase, short-circuited; it is located in stator slots of the main magnet core. The first winding of rotor is connected to toroidal windings of auxiliary magnet core of the rotor; the first winding of stator is connected to output of frequency converter which converts electric energy of current frequency of the second armature winding to required value of control frequency and delivers it to stator winding of the main magnet core in order to create excitation current and rotating electromagnetic field with this control frequency. Control frequency is set at the output so that frequency of output current is permanent notwithstanding frequency of drive rotation.
EFFECT: reducing weight and overall dimensions and improving cooling and ventilation systems.
FIELD: electrical engineering.
SUBSTANCE: transformer part of the unit has the primary winding connected to three-phase network and the secondary winding connected to z-phase bar winding placed inside z groves of the transformer magnet core at one side closed by the short-circuited ring and at the other side connected to Z bars of the stator winding. Propulsion part of the unit contains asynchronous engine with disc squirrel-cage rotor located between two disc stators with bar windings electrically connected to the secondary bar winding of the transformer and from the other side by closed short-circuited rings. Bars of the secondary transformer winding are connected to Z bars of stator windings by bars used as sealed leads-in and located in a sealed bulkhead.
EFFECT: improvement of energy response and reliability of propulsion-transformer unit with simultaneous extension of its application area.
4 cl, 4 dwg
SUBSTANCE: axial cascade electric drive comprises two coaxially connected electric motors, besides, magnetic systems of two electric motors are made axial and are arranged in one body and on a common shaft, which is horizontally fixed in bearing units of the body, besides, by one side the stator of one electric motor is rigidly connected to the body, and on its other side between the three-phase winding and the shaft hole there are coils of controlled couplings, which are located oppositely to two rings of large and small diameters from a non-magnetic material, a rotor arranged on the bearing, at the other side of which there are ring-shaped slots, the free space of which is filled with a ferromagnetic powder. At the same time, according to the invention, the rotor of the other electric motor is arranged on the bearing and has a ledge in the form of a wide thin ring from the same material as the rotor itself, and enters the slot of the large diameter of the rotor of the other electric motor, providing when connected to the network of one coil of the controlled coupling rigid connection of the rotor of one electric motor with the rotor of the other electric motor, the stator of which is rigidly connected with the shaft, besides, between the rotor of one and rotor of the other electric motor there is a metal part arranged rigidly in the form of a hollow sleeve, with the ledge entering the slot of small diameter of the rotor of one of electric motors, providing when supplying voltage of the supply network to the other coil of the controlled coupling the rigid connection of the rotor of one of electric motors with the common shaft, which is the output one, and on the rotor of the other electric motor there is a ledge of magnetic material, which enters the body of the ferropowder coupling fixed on the body of the electric drive, besides, additionally comprising a current pickup device, the fixed part of which is rigidly fixed on the body of the electric drive, and the movable part is installed on the shaft and supplies electric energy for the widing of the stator rigidly connected to the shaft.
EFFECT: invention provides for getting high speeds of rotation, close to a double rated one at rated value of the torque value, or getting a double torque at rated speed of rotation for a different range of capacities of an electric drive with simultaneous increase of such drive operation reliability.
2 cl, 1 dwg
SUBSTANCE: invention refers to cascade electric actuators of rotational movement, which consist at least of two asynchronous motors of the same type, and can be used at creation of electric actuators with controlled rotation speed from nominal to double nominal at constant moment, or actuators with double moment at constant nominal rotation speed, as well as at creation of other types of electric actuators. Controlled cascade electric actuator includes two electric motors coaxially installed in housing, each of which consists of rotor and stator; besides, stator of the first electric motor is fixed on housing, and its rotor is fixed on its shaft; fastening rings two of which are fixed on the housing, and the other one is fixed on shaft of the first electric motor, electromagnetic clutches fixed on the housing of electric actuator, three-phase power supply system; rotor of the second electric motor is movable and installed so that it can be freely rotated relative to its shaft, and stator of the second electric motor is fixed on its shaft. Fastening ring rigidly fixed on housing of controlled cascade electric actuator on which there installed are three fixed friction semi-clutches one of which has the possibility of being pulled in order to fix the friction gasket (installed on the first shaft) of its movable semi-clutch sliding along splined recesses of electric motor shaft with freely rotating rotor; the other semi-clutch has the possibility of being pulled in order to fix to the same friction gasket of its semi-clutch entering the cavity of housing of movable rotor, which is coaxial to the above semi-clutch, and the third semi-clutch has the possibility of being pulled in order to fix to the other friction gasket fixed on the electric actuator housing of its semi-clutch entering the cavity of movable rotor housing, which is coaxial to the above semi-clutch.
EFFECT: improved design of cascade electric actuator due to operation improvement of system of electromagnetic clutches and power supply system of one of asynchronous motors, which provides obtaining of high rotation speeds close to double nominal, at nominal value of moment or obtaining of double moment at nominal rotation speed.
3 cl, 1 dwg
SUBSTANCE: invention relates to the field of electric engineering, in particular, to AC electric drives, and may be used as electromechanical converter for mechanisms, having elastic connection to fixed support. In doubled induction motor, including two rotors with short-circuited windings, fixed stator and movable stator, according to invention, rotors are arranged on different shafts, movable stator is rigidly connected to rotor related to fixed stator, and each of stators is connected to network via individual frequency converter, including metering system and speed controller.
EFFECT: prevention of oscillating loads, and also reduction of electromagnet and mechanical losses at start and in the mode of load overcoming.
SUBSTANCE: invention relates to cascade electric rotary actuator drives and may be used for production of gearless drives with frequency adjusted from 0 to double nominal at stable nominal rotation speed including reversible and other type drives. The proposed controllable cascade electric drive contains two electric motors mounted coaxially on the housing. Each motor is composed of a rotor rigidly mounted on its shaft and a stator. The stator of one of the electric motors is designed as stationary and is mounted on the housing while the second motor stator is capable of free motion relative of the shaft. According to the invention concept, it additionally contains a fixture ring rigidly mounted on the shaft of the stationary stator motor. Mounted on the fixture ring are two e-magnetic clutches one of them capable of contact with the friction plate that has a projection fitting into the movable stator body concavity which is coaxial to the said projection. The other e-magnetic clutch is capable of contact with its friction plate and of connection, with the help of the said plate, to the movable stator electric motor shaft that has a splined recess for the friction plate to fit in. The working areas of the above two friction plates that come in contact with the above e-magnetic clutches are equal to provide for identical performance of the said e-magnetic clutches. Mounted on the drive housing is a third e-magnetic clutch capable of contact with a third friction plate that has a projection fitting into the movable stator body having a concavity which is coaxial to the said projection of the third friction plate.
EFFECT: extension of the range of the cascade electric drive adjustment due to provision for generation of high rotation speeds close to double the nominal one at constant torque value or possibility to generate a doubled torque value at constant rotation speed.
2 cl, 6 dwg
FIELD: electrical engineering; specific electrical machines for off-line power supplies.
SUBSTANCE: proposed self-excited induction generator designed for operation under abnormal environmental conditions and in hermetically sealed power-generating units has squirrel-cage rotor and core-shaped stator with Z teeth whose slots receive stator winding, as well as field capacitors; novelty is that stator winding is made in the form of Z bars closed on one end by means of end ring. Generator also has additional magnetic core with slots receiving three-phase winding and conducting bars connected on one end with Z bars of stator winding and on other end they are closed by means of other end ring to form Z-phase winding.
EFFECT: enhanced reliability, reduced mass and size of induction generator.
5 cl, 3 dwg
FIELD: electrical engineering.
SUBSTANCE: core plates are made in the area of internal diameter with slots concentric in relation to this diameter at least in two rows; at that there are at least two slots in each row and bridges between slots are located in the middle of slots in the next row; at that joining of elements fixing core ends to the shaft is made at radial depth from the first row of concentric slots and joining of axial fixing elements to core ends is spread in radial direction to the shaft not farther then the last row of slots from the shaft.
EFFECT: prevention of impact of unevenly compacted rotor core on the rotor shaft of an electrical machine.
4 cl, 5 dwg